<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			  function select_one(obj)
			  {
			  	//obj.options[obj.options.length] = new Option('2006','2005');
			  	var option01 = new Option('2006','2005'); 
			  	obj.appendChild(option01);
			  	
			  	for (var i = 0; i<obj.options.length;i++) {
			  		if(obj.options[i].selected)
			  		{
			  			alert(obj.options[i].text);
			  		}
			  	}
			  }
		</script>
	</head>
	<body>
		<select name="aaa" onchange="select_one(this)">
			 <option value="2000">2000</option>
			 <option value="2000">2001</option>
			 <option value="2000">2002</option>
			 <option value="2000">2003</option>
			 <option value="2000">2004</option>
		</select>
	</body>
</html>
